<template>
  <div class="login" :style="'background-image:url('+ Background +');'">
    <el-form ref="loginForm" :model="loginForm" :rules="loginRules" label-position="left" label-width="0px"
             class="login-form">
      <h3 class="title">
        eladmin-plus 后台管理系统
      </h3>
      <el-form-item prop="username">
        <el-input v-model="loginForm.username" type="text" auto-complete="off" placeholder="账号">
          <svg-icon slot="prefix" icon-class="user" class="el-input__icon input-icon"/>
        </el-input>
      </el-form-item>
      <el-form-item prop="password">
        <el-input v-model="loginForm.password" type="password" auto-complete="off" placeholder="密码"
                  @keyup.enter.native="handleLogin">
          <svg-icon slot="prefix" icon-class="password" class="el-input__icon input-icon"/>
        </el-input>
      </el-form-item>
      <el-form-item v-if="codeEnabled" prop="code">
        <el-input v-model="loginForm.code" auto-complete="off" placeholder="验证码" style="width: 63%"
                  @keyup.enter.native="handleLogin">
          <svg-icon slot="prefix" icon-class="validCode" class="el-input__icon input-icon"/>
        </el-input>
        <div class="login-code">
          <img :src="codeUrl" @click="getCode">
        </div>
      </el-form-item>
      <el-checkbox v-model="loginForm.rememberMe" style="margin:0 0 25px 0;">
        记住我
      </el-checkbox>
      <el-form-item style="width:100%;">
        <el-button :loading="loading" size="medium" type="primary" style="width:100%;"
                   @click.native.prevent="handleLogin">
          <span v-if="!loading">登 录</span>
          <span v-else>登 录 中...</span>
        </el-button>
      </el-form-item>
    </el-form>
    <!--  底部  -->
    <div v-if="$store.state.settings.showFooter" id="el-login-footer">
      <span v-html="$store.state.settings.footerTxt"/>
      <span> ⋅ </span>
      <a href="https://beian.miit.gov.cn/#/Integrated/index" target="_blank">{{ $store.state.settings.caseNumber }}</a>
    </div>
  </div>
</template>

<script>
  import {encrypt} from '@/utils/rsaEncrypt'
  import Config from '@/settings'
  import {getCodeImg} from '@/api/login'
  import Cookies from 'js-cookie'
  import qs from 'qs'
  import Background from '@/assets/images/background.jpg'

  export default {
    name: 'Login',
    data() {
      return {
        Background: Background,
        codeUrl: '',
        cookiePass: '',
        loginForm: {
          username: 'admin',
          password: '123456',
          rememberMe: false,
          code: '',
          uuid: ''
        },
        loginRules: {
          username: [{required: true, trigger: 'blur', message: '用户名不能为空'}],
          password: [{required: true, trigger: 'blur', message: '密码不能为空'}],
          code: [{required: true, trigger: 'change', message: '验证码不能为空'}]
        },
        loading: false,
        redirect: undefined,
        codeEnabled: false
      }
    },
    watch: {
      $route: {
        handler: function (route) {
          const data = route.query;
          if (data && data.redirect) {
            this.redirect = data.redirect;
            delete data.redirect;
            if (JSON.stringify(data) !== '{}') {
              this.redirect = this.redirect + '&' + qs.stringify(data, {indices: false})
            }
          }
        },
        immediate: true
      }
    },
    created() {
      // 获取验证码
      this.getCode();
      // 获取用户名密码等Cookie
      this.getCookie();
      // token 过期提示
      this.point()
    },
    methods: {
      getCode() {
        getCodeImg().then(res => {
          if (res.enabled === 0) {
            this.codeEnabled = false;
            return
          }
          this.codeEnabled = true;
          this.codeUrl = res.img;
          this.loginForm.uuid = res.uuid
        })
      },
      getCookie() {
        const username = Cookies.get('username');
        let password = Cookies.get('password');
        const rememberMe = Cookies.get('rememberMe');
        // 保存cookie里面的加密后的密码
        this.cookiePass = password === undefined ? '' : password;
        password = password === undefined ? this.loginForm.password : password;
        this.loginForm = {
          username: username === undefined ? this.loginForm.username : username,
          password: password,
          rememberMe: rememberMe === undefined ? false : Boolean(rememberMe),
          code: ''
        }
      },
      handleLogin() {
        this.$refs.loginForm.validate(valid => {
          const user = {
            username: this.loginForm.username,
            password: this.loginForm.password,
            rememberMe: this.loginForm.rememberMe,
            code: this.loginForm.code,
            uuid: this.loginForm.uuid
          };
          if (user.password !== this.cookiePass) {
            user.password = encrypt(user.password)
          }
          if (valid) {
            this.loading = true;
            if (user.rememberMe) {
              Cookies.set('username', user.username, {expires: Config.passCookieExpires});
              Cookies.set('password', user.password, {expires: Config.passCookieExpires});
              Cookies.set('rememberMe', user.rememberMe, {expires: Config.passCookieExpires});
            } else {
              Cookies.remove('username');
              Cookies.remove('password');
              Cookies.remove('rememberMe');
            }
            this.$store.dispatch('Login', user).then(() => {
              this.loading = false;
              this.$router.push({path: this.redirect || '/'})
            }).catch(() => {
              this.loading = false;
              this.getCode()
            });
          } else {
            console.log('error submit!!');
            return false
          }
        })
      },
      point() {
        const point = Cookies.get('point') !== undefined;
        if (point) {
          this.$notify({
            title: '提示',
            message: '当前登录状态已过期，请重新登录！',
            type: 'warning',
            duration: 5000
          });
          Cookies.remove('point');
        }
      }
    }
  }
</script>

<style type="text/scss" rel="stylesheet/scss" lang="scss">
  .login {
    display: flex;
    justify-content: center;
    align-items: center;
    height: 100%;
    background-size: cover;
  }

  .title {
    margin: 0 auto 30px auto;
    text-align: center;
    color: #707070;
  }

  .login-form {
    border-radius: 6px;
    background: #ffffff;
    width: 385px;
    padding: 25px 25px 5px 25px;

    .el-input {
      height: 38px;

      input {
        height: 38px;
      }
    }

    .input-icon {
      height: 39px;
      width: 14px;
      margin-left: 2px;
    }
  }

  .login-tip {
    font-size: 13px;
    text-align: center;
    color: #bfbfbf;
  }

  .login-code {
    width: 33%;
    display: inline-block;
    height: 38px;
    float: right;

    img {
      cursor: pointer;
      vertical-align: middle
    }
  }
</style>
